Doepfer

One more post...

This VCO will consist of four PCBs.  Two jack boards (much like 
what Dieter and Bob WIlliams do), the main board and mounted 
to that will be an epoxy sealed module.

I am not trying to pull an Alan R. Pearlman here (sealed 
modules) .  This boardlette is sealed in heat-conductive epoxy to 
maximize temperature stability of the all-important expo 
converter, which in turn will greatly improve stability.  The tempco 
resister is an SMT chip type (SMT tempcos = better heat transfer) 
which will be mounted physically directly underneath the 'money' 
parts, the matched transistor pair which governs the oscillating 
frequency of the core.

Why am I telling you this?

This is gong to pull the price up about $5 to 10 USD for the labor 
involved in potting these boardlettes - but it will pay dividends in 
stability.

- Peter